Rouba El-Husseini| Agence France Presse
OMAR OIL FIELD, Syria: Among thousands fleeing the crumbling dream of a Daesh (ISIS) "caliphate" in eastern Syria are survivors of some of the militant group’s worst atrocities.

"I'll never forget," 40-year-old Bissa says softly, as she recounts being "bought and sold" by six different militants.

"We did everything they wanted to do with us. We couldn't say no," says the Iraqi woman from the Yazidi religious minority, after fleeing her Daesh captors.

Bissa was one of at least seven Yazidi women and girls to finally escape captivity last week, after years as "sex slaves" at the hands of the extremist group.

Speaking to AFP in territory held by U.S.-backed forces, the women – and at least one teenager abducted when she was 13 – say they just want to go home.

"They would sleep with us against our will," Bissa tells AFP, wearing a dark red headscarf and appearing years beyond her age, her face and hands etched with lines.

More than 36,000 people have fled a crumbling Daesh holdout near the Iraqi border in recent weeks, among them 3,200 alleged militants.

But now in territory held by the U.S.-backed Syrian Democratic Forces, none perhaps have tales so harrowing as the Yazidi women.

In 2014, Daesh rampaged across swathes of Syria and neighboring Iraq – including the northern Iraqi region of Sinjar, home to a large Yazidi community.

The Kurdish-speaking Yazidis follow an ancient religion rooted in Zoroastrianism, but Daesh considers them to be "apostates".

In Sinjar, Daesh fighters killed the men, forcefully enlisted boys as soldiers and kidnapped more than 6,000 women.

After Bissa was captured, she was "bought and sold" by six different militants – including three Saudis and a fighter who said he was Swedish.

She was repeatedly brutalized, but was too scared to escape.

"They said whoever tried ... would be punished by a different man sleeping with her every day," she says inside an SDF center near the Omar oil field.

But 17-year-old Nadine, kidnapped from Sinjar when she was just 13, says she twice tried to escape.

Both times the group's police caught her.

"They flogged me with a hose. It left marks on my back, and I couldn't sleep on it," she says.

"The second time, they said I couldn't eat for two days," she added.

After they abducted Nadine, Daesh took her across the border to the group's then de facto Syrian capital of Raqqa.

Over four years, she says, six different men bought her – Saudis and a Tunisian.

She had to adapt to their brutal interpretation of religion, and adhere to their strict dress code of covering from head to toe in public.

"I love color, and I used to wear trousers," Nadine tells AFP.

Inside the SDF center, she wears a black-and-white bead bracelet around her wrist, bearing the name of her little brother in English.

But she can't bring herself to remove her black face veil.

"I got used to it. I can't yet take it off," she says. "But I will do so when I see my mum."

After escaping, Nadine says several cousins are still being held in a Daesh pocket in eastern Syria.

At the height of its rule, Daesh controlled territory the size of Britain, but today it has lost all but the eastern patch to various offensives – including by the SDF, backed by airstrikes of the U.S.-led coalition.

Between 2015 and 2018, at least 129 Yazidi women and girls were handed over to the Kurdish Women's Protection Units (YPJ), who are part of the SDF.